Toán Lớp 7: a)x : $\frac{12}{13}$ = $\frac{-26}{27}$
b) ( $\frac{1}{3}$)^ 2x-1 – ($\frac{1}{3}$ ) ^2 = $\frac{-2}{27}$
c) ( 3- $\frac{1}{2}$ .x (|x+ $\frac{3}{4}$ | – $\frac{5}{6}$ =0
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Toán Lớp 7: a)x : $\frac{12}{13}$ = $\frac{-26}{27}$
b) ( $\frac{1}{3}$)^ 2x-1 – ($\frac{1}{3}$ ) ^2 = $\frac{-2}{27}$
c) ( 3- $\frac{1}{2}$ .x (|x+ $\frac{3}{4}$ | – $\frac{5}{6}$ =0
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